1,721,104 research outputs found
Fatigue-Induced Balance Impairment in Young Soccer Players
No full textContext: Although balance is generally recognized to be an important feature in ensuring good performance in soccer, its link with functional performance remains mostly unexplored, especially in young athletes.
Objective: To investigate changes in balance induced by fatigue for unipedal and bipedal static stances in young soccer players.
Design: Crossover study.
Setting: Biomechanics laboratory and outdoor soccer field.
Patients or Other Participants: Twenty-one male soccer players (age = 14.5 ± 0.2 years, height = 164.5 ± 5.6 cm, mass = 56.8 ± 6.8 kg).
Intervention(s): Static balance was assessed with postural-sway analysis in unipedal and bipedal upright stance before and after a fatigue protocol consisting of a repeated sprint ability (RSA) test (2 × 15-m shuttle sprint interspersed with 20 seconds of passive recovery, repeated 6 times).
Main Outcome Measure(s): On the basis of the center of pressure (COP) time series acquired during the experimental tests, we measured sway area, COP path length, and COP maximum displacement and velocity in the anteroposterior and mediolateral directions.
Results: Fatigue increased all sway values in bipedal stance and all values except COP velocity in the mediolateral direction in unipedal stance. Fatigue index (calculated on the basis of RSA performance) was positively correlated with fatigue/rest sway ratio for COP path length and COP velocity in the anteroposterior and mediolateral directions for nondominant single-legged stance.
Conclusions: Fatigued players exhibited reduced performance of the postural-control system. Participants with better performance in the RSA test appeared less affected by balance impairment, especially in single-legged stance
Conservare il germoplasma e la variabilità genetica
No full textConoscere le erbe e le piante, raccoglierle, studiarle: l'obiettivo è riuscire a interpretare l'ambiente naturale e accentuare la sensibilità ai particolari della vita delle piante e della loro integrazione con l'ambiente nel quale vivono. Quest'opera a più voci ha per oggetto tutti i settori della botanica, con particolare attenzione alla botanica ambientale che ha conosciuto in questi ultimi anni un notevole sviluppo permettendo di affrontare problematiche importanti come la gestione degli ambienti naturali, dai parchi ai giardini, dagli erbari agli orti botanici.
Come realizzare una collezione vegetale, cioè un erbario, evidenziando il significato scientifico, culturale e didattico della raccolta stessa e riscoprendo così, grazie all'osservazione diretta, le peculiarità territoriali e paesaggistiche e le loro modificazioni in seguito all'azione diretta o indiretta delle attività umane
Analisi della diversità genetica in germoplasma sardo di orzo (Hordeum vulgare) mediante l'uso di marcatori molecolari RAPD
No full textThe value of agrobiodiversity: an analysis of consumers preference for tomatoes
No full textThe valorization of plant genetic resources and their direct use in local markets can make a significant contribution to the preservation of agrobiodiversity, while also contributing to the sustainability of rural communities. Indeed, plant genetic resources are a precious source of genes, and they represent an important crop heritage for the quality and sensory characteristics that are required by both farmers and consumers. However, an efficient strategy of agrobiodiversity conservation is strictly connected to product marketability and to consumer preferences. In the present study, choice experiments that involved 920 consumers were carried out to determine their willingness to pay for ancient local tomato varieties (landraces) rather than commercial varieties based on their preferences, and to determine how much they valued these products. The results obtained indicate that consumers are willing to pay premium prices for ancient local tomato varieties (an additional €0.90 kg-1), thus demonstrating their increasing attention to sustainable food and the willingness to contribute to agrobiodiversity conservation and enhancement. These results provide the basis for planning strategies and programs to support the cultivation of these landraces and the development of regional and national markets to acknowledge their characteristics, which will considerably increase the effectiveness and efficiency of conservation strategies
Sprint vs. intermittent training young female basketball players
No full textThis study aimed at comparing the effects of intermittent and repeated sprint ability training on physiological variables.Sixteen young female basketball players were randomly allocated to intermittent training (IT=8) or repeated sprint ability training (RST=8) groups. The following outcomes were measured at baseline and after 6 weeks of training: Yo-Yo intermittent recovery (Yo-Yo) and repeated sprint ability (RSA) tests.For all the variables investigated the effect of training type showed a different trend respect at current knowledge. In the RSA, best time (BT) was a significant main effect of training time (pre- vs. post-) (P<0.0001), and of the interaction training type/time (P=0.03). The RST showed a decrease in BT of 3.1\% (P=0.005) while the IT showed a decrease of 6.2\% (P<0.0001). In the IT there was a significant main effect of time for the total distance with an increment of 26.9\%, and a significant main effect of time in the final speed with an increment of 1.23\%.These findings suggest that the two training methods used in this study can be an effective training strategy for inducing anaerobic and basketball-specific training schedules. Besides, even when IT training is not done at very high speed, it can increase the maximum speed of the RSA
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